What brand fuel injector cleaner?

That is still all just armchair theory. The fact is that you can eliminate the goo by changing the oil often enough. So you need to come up with a theory that explains the facts.

The amount that gets by the baffles and pcv valve or orifice is directly related to the size of the airborne particles which is directly related to how much the oil has been broken down. It is my understanding that the way the chemistry of automotive oil works is that the large chains of oil get broken all the time and small chains also bind and form new longer chains all the time. The tendency to make or brake chains is related to the length. Short chains have a stronger attraction to bind than longer ones. The tiny particles of dirt in an engine that are too small for filters get incorporated into these chains. That's why the oil gets dirty eventually turning black. But chains of old and dirty oil are not as strong as in clean fresh oil so there is a much increased amount of small fragments in the oil spray and mist as the oil gets old and dirty.

How does your theory that the source is from oil vapors not also consume some oil?

-jim

Techron is the best about $20 a quarrt and worth every penny

Not *all* of them are kerosine. Some of the better cheapo's have detergent, and may help a little bit.

I dont waste my money on those, and when someone gives me some ( which happens often, I teach high school auto shop) I use it for small parts washing and such.

Techron has an additive that gets between the carbon and the metal and helps it slough off. It's not a detergent and doesnt dissolve hard carbon (neither do any of the detergents. All of them work OK on softcarbon).. It's poly proply somethingorother. The only other additive I use is the SeaFoam that someone else mentioned. HTH Ben I have used these both extensively with good results; Techron is magic on dirty injectors, SeaFoam is magic on throttle plates and intake manifolds

Whatever it is (and it can only be from blowby or egr) it is carbon like whatever sludgy goopy crap that causes poor idle and throttle tip-in hesitations. This is where SeaFoam excels for me. I have used many gallons and fixed countless such problems with it.

HTH

Ben

I have numerous cars that I have cared for properly since new that get that crappy buildup on the back of the throttle plate and in the intake. Just my personal experience on several hundred cars of all makes and models. HTH Ben

"crappy buildup on the back of the throttle plate " was not really what the discussion was about. The question under discussion was how gooey and sticky the deposits are in the PCV system. If its gooey and sticky (and black) in the PCV plumbing that is something that can be remedied by more frequent oil changes. Black sooty deposits on the back of your throttle plate is not the same thing. For one thing the gooey and sticky stuff can be cleaned fairly easy with just about any solvent. That alone should be a clue that they are not the same substance.

What experience? You have revealed practically nothing that inspires any confidence in your ability to observe even one car. For instance, if the substance in your PCV is gooey sticky and brown you have another entirely different problem even though you probably would still say that you have a "crappy buildup" and that your car is "cared for properly".

-jim

I don't agree that you've stated a fact. PCV goo always forms, no matter how often you change the oil.

This is where we say "duh." Of COURSE it does- ALL piston engines consume a minute amount of oil.

Which is PRECISELY the substance that back-drafts onto the throttle plates and builds up there!!!!

Nothing at all precise about that. An observant viewer can tell a lot about the condition of engine and the type of driving and maintenance by the nature of the substance. An unobservant viewer thinks the description "crappy buildup" is precise.

-jim

Your theory is wrong. As I said at the beginning of the thread - I have no evidence that changing the oil often enough to eliminate all gooey substance will do any good in the long run, but it can be done. The nature of the substance is the key. if you are of the opinion that all substances are precisely the same then obviously you are never going to make the necessary observations that would allow you to reach any sort of meaningful analysis no matter what you do.

Yes that was the intended point - you brought up the consumption of oil and now apparently you think including it in the discussion is silly.

-jim